header{
	height:70px;
	width: 100%;
	position: relative;

	background-color:gray;
}

.header-menu{
	width: 100%;
}
.header-menu > ul{
	background-color: #e3e3e3;
    display: inline-block;
    width: inherit;
}
.header-menu > ul > li{
	float:left;
	padding:10px 20px;
	cursor: pointer;
}